Mental illness starts with the soul. Think about it. Beauty speaks to and inspires the parts of the soul words cannot reach. Without that light in the inner places, the soul goes dark. Heart sickness sets in, and the will longs for destruction. It doesn't consider it's own destruction at first, but it wants everything to be as dark and uninspired as it is. It doesn't take long for the heart sickness to make it's way to the mind. The mind willingly obliges with destructive thoughts and actions.